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From dwarf galaxies to galaxy clusters: Self-Interacting Dark Matter over 7 orders of magnitude in halo mass | Kyrylo Bondarenko
; Anastasia Sokolenko
; Alexey Boyarsky
; Andrew Robertson
; David Harvey
; Yves Revaz
; | Date: |
11 Jun 2020 | Abstract: | In this paper we study the density profiles of self-interacting dark matter
(SIDM) haloes spanning the full observable mass range, from dwarf galaxies to
galaxy clusters. Using realistic simulations that model the baryonic physics
relevant for galaxy formation, we compare the density profiles of haloes
simulated with either SIDM or cold and collisionless dark matter (CDM) to those
inferred from observations of stellar velocity dispersion, gas rotation curves,
weak and strong gravitational lensing, and/or X-ray maps. We make our
comparison in terms of the maximal surface density of haloes, circumventing the
need for semi-analytic or parametric models for dark matter density profiles.
We find that the maximal surface density as a function of halo mass is well
reproduced by simulations of CDM that include baryons, and that a SIDM
cross-section of 1 cm$^2/$g is marginally excluded. This constraint is driven
mainly by galaxy clusters, with less massive systems being relatively less
affected by DM self-interactions with velocity-independent cross-section. | Source: | arXiv, 2006.6623 | Services: | Forum | Review | PDF | Favorites |
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